# # GPIO引脚、吸泵相关函数

# print('导入吸泵控制模块')
# import RPi.GPIO as GPIO
# import time

# # 初始化GPIO
# GPIO.setwarnings(False)   # 不打印 warning 信息
# GPIO.setmode(GPIO.BCM)
# GPIO.setup(20, GPIO.OUT)
# GPIO.setup(21, GPIO.OUT)
# GPIO.output(20, 1)        # 关闭吸泵电磁阀

# def pump_on():
#     '''
#     开启吸泵
#     '''
#     print('    开启吸泵')
#     GPIO.output(20, 0)

# def pump_off():
#     '''
#     关闭吸泵，吸泵放气，释放物体
#     '''
#     print('    关闭吸泵')
#     GPIO.output(20, 1)   # 关闭吸泵电磁阀
#     time.sleep(0.05)
#     GPIO.output(21, 0)   # 打开泄气阀门
#     time.sleep(0.2)
#     GPIO.output(21, 1)
#     time.sleep(0.05)
#     GPIO.output(21, 0)   # 再一次泄气，确保物体释放
#     time.sleep(0.2)
#     GPIO.output(21, 1)
#     time.sleep(0.05)